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Why were Dobereiner , Newlands and M...

Why were Dobereiner , Newlands and Mendeleeff not 100 % successful in their classfication of elements ? Why is the modern table table relatively a better classification ? Predict the reason .

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`-`All the known elements at the time of Dobereiner could not be arranged in the form of triads .
- Newlands' periodic table was restried only for 56 elements .
- As mendeleff classification pair of elements and dissimilar elements placed together .
- Modern periodic table was prepared on the basis of atomic number . So the periodic and group are clearly defined .
Hence Dobereiner , newlands , and Mendeleff's classifications were not 100% successful but modern classification is successful .
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